HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ajaxComplete append #msg</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    button { padding: 8px 14px; margin-right: 8px; cursor: pointer; border-radius: 6px; border: 1px solid #cbd5e1; background: #fff; }
    #msg { margin-top: 14px; padding: 12px; background: #f8fafc; border: 1px dashed #94a3b8; border-radius: 6px; min-height: 48px; }
  </style>
</head>
<body>
  <button type="button" id="one">Run one request</button>
  <button type="button" id="three">Run three requests</button>
  <div id="msg">Messages:</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(document).on("ajaxComplete", function(event, request, settings) {
      $("#msg").append(" Request Complete. ");
    });

    $("#one").on("click", function() {
      $.get("https://jsonplaceholder.typicode.com/posts/1");
    });

    $("#three").on("click", function() {
      $.get("https://jsonplaceholder.typicode.com/posts/1");
      $.get("https://jsonplaceholder.typicode.com/posts/2");
      $.get("https://jsonplaceholder.typicode.com/posts/3");
    });
  </script>
</body>
</html>

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jQuery ajaxComplete — append to #msg (Try It)